Cold heading die for automobile nut

Abstract

The utility model discloses an automobile nut cold heading die which comprises a base, a plurality of forming dies are detachably installed on the outer wall of one end of the base, each forming die comprises an upper die shell and a lower die shell, the upper die shells are in threaded connection with the lower die shells, sliding cavities are formed in the inner walls of the lower die shells, and the upper die shells and the lower die shells are in threaded connection. The inner wall of the sliding cavity is in sliding fit with a mold ejector pin, the mold ejector pin comprises an upper ejector pin and a lower ejector pin, the top end of the lower ejector pin is provided with a connecting hole, the bottom end of the upper ejector pin is connected with a connecting rod, the connecting rod is in longitudinal sliding fit with the connecting hole, and the outer wall of the top end of the lower ejector pin is in threaded fit with a threaded sleeve; the outer wall of the bottom end of the upper ejector pin is provided with external threads matched with the threads of the threaded sleeve. By arranging the upper mold shell, the lower mold shell, the upper ejector pin, the lower ejector pin and the threaded sleeve, when the mold ejector pin needs to be replaced due to abrasion, only the upper ejector pin needs to be replaced, the whole mold ejector pin does not need to be replaced, and the use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cold heading dies, in particular to a cold heading die for automobile nuts. Background Art

[0002] Cold heading dies are a processing method that utilizes the plastic deformation of metal under external forces to redistribute and shift the metal's volume through the die, thereby forming the desired part or blank. The cold heading process is most suitable for producing standard fasteners such as bolts, screws, nuts, rivets, and pins. The cold heading die is one of the most important components in the cold heading process.

[0003] During the cold heading process, the ejector pin in the cold heading die mainly serves to eject the cold-forged product from the die. In actual use, since the product is cold-formed in the cold heading process, the product is often pressed tightly in the die. In this way, the force required to eject the product from the die is relatively large. Over a long period of use, the top of the ejector pin often contacts the product, causing wear and tear, requiring frequent replacement. The cost of replacing the entire ejector pin is high. Summary of the Invention

[0004] The utility model aims to solve the shortcomings in the prior art and provides a cold heading die for automobile nuts.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A cold heading die for automobile nuts comprises a base, and a plurality of forming dies are detachably mounted on the outer wall of one end of the base, the forming die comprising an upper die shell and a lower die shell, the upper die shell being threadedly connected to the lower die shell, a sliding cavity being provided on the inner wall of the lower die shell, a die ejector pin being slidably fitted on the inner wall of the sliding cavity, the die ejector pin comprising an upper ejector pin and a lower ejector pin, a connecting hole being provided on the top end of the lower ejector pin, a connecting rod being connected to the bottom end of the upper ejector pin, the connecting rod being longitudinally slidably fitted with the connecting hole, a threaded sleeve being threadedly fitted on the outer wall of the top end of the lower ejector pin, and an external thread being threadedly fitted with the threaded sleeve on the outer wall of the bottom end of the upper ejector pin.

[0007] As a further solution of the present invention: guide rods are fixed to the outer walls of both sides of the base, and the outer walls of the two guide rods are slidably connected to the same pressure plate, and the outer wall of one end of the pressure plate is provided with an extrusion block opposite to the forming mold.

[0008] As a further solution of the present invention: the inner wall of the upper mold shell is slidably matched with a mold core, and the outer wall of the mold core and the inner wall of the upper mold shell are both conical surfaces.

[0009] As a further solution of the present invention: a cavity is opened at the top of the mold core, the top of the mold core and the outer wall of the top of the cavity are located in the same plane, a return spring is provided on the inner wall of the sliding cavity, and the outer wall of the mold ejector is connected to the inner wall of the sliding cavity.

[0010] As a further solution of the present invention: the forming mold and the base are connected by a connecting component, and the connecting component includes a connecting groove and a sliding groove. The connecting groove is opened on the outer wall of the base, and the sliding groove is opened on the side wall of the connecting groove.

[0011] As a further solution of the present invention: the forming die is in sliding cooperation with the inner wall of the connecting groove, the inner wall of the bottom end of the connecting groove is connected to a push plate through a push spring, and the push plate is in sliding cooperation with the inner wall of the connecting groove.

[0012] As a further solution of the present invention: a positioning plate is slidably connected to the inner wall of the sliding groove, and a limiting hole that cooperates with the positioning plate is opened on the side wall of the forming mold.

[0013] As a further solution of the present invention: a fixing bolt is threadedly matched with the top end of the positioning plate, and a positioning hole is provided at the bottom end of the sliding groove to be threadedly matched with the fixing bolt.

[0014] Compared with the prior art, the present invention provides a cold heading die for automobile nuts, which has the following beneficial effects:

[0015] The utility model is provided with an upper mold shell, a lower mold shell, an upper ejector pin, a lower ejector pin and a threaded sleeve. When the ejector pin of the mold is worn and needs to be replaced, only the upper ejector pin needs to be replaced, and there is no need to replace the entire ejector pin of the mold, thereby reducing the use cost.

[0016] The utility model is provided with a connecting hole, a connecting rod and a threaded sleeve. The connecting rod is inserted into the connecting hole to increase the connection area between the upper ejector and the lower ejector, and the threaded sleeve covers the connection between the upper ejector and the lower ejector, thereby enhancing the stability of the connection between the upper ejector and the lower ejector, and preventing the connection between the upper ejector and the lower ejector from being bent or broken by force when the mold ejector rises to remove the material.

[0017] The utility model is provided with a connecting assembly, which shortens the disassembly time compared with the traditional multi-bolt fixation, and facilitates the disassembly of the forming mold. At the same time, the pushing spring pushes the forming mold through the pushing plate, which can avoid the difficulty of removing the forming mold from the base due to the tight fit between the forming mold and the base.

[0018] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic diagram of the overall structure of a cold heading die for automobile nuts proposed in the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of a cold heading die for automobile nuts proposed in the present invention;

[0021] Figure 3 This is a schematic diagram of the connection structure of the upper ejector and the lower ejector of a cold heading die for automobile nuts proposed by the utility model;

[0022] Figure 4 The utility model is a schematic diagram of the connection structure of a cold heading die forming die and a base for a nut for automobile use.

[0023] In the figure: 1. Base; 2. Pressing plate; 3. Guide rod; 4. Forming mold; 5. Upper mold shell; 6. Lower mold shell; 7. Mold core; 8. Cavity; 9. Mold ejector pin; 10. Sliding cavity; 11. Return spring; 12. Upper ejector pin; 13. Lower ejector pin; 14. Connecting hole; 15. Connecting rod; 16. Threaded sleeve; 17. Connecting groove; 18. Sliding groove; 19. Positioning plate; 20. Fixing bolt; 21. Positioning hole; 22. Push plate; 23. Push spring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. Example

[0026] A cold heading die for automobile nuts, such as Figures 1 to 3As shown, it includes a base 1, and guide rods 3 are fixed to the outer walls of both sides of the base 1. The outer walls of the two guide rods 3 are slidably connected to the same pressure plate 2. A plurality of forming molds 4 are detachably installed on the outer wall of one end of the base 1, and an extrusion block opposite to the forming mold 4 is provided on the outer wall of one end of the pressure plate 2. The forming mold 4 includes an upper mold shell 5 and a lower mold shell 6. The upper mold shell 5 is threadedly connected to the lower mold shell 6. The inner wall of the upper mold shell 5 is slidably matched with a mold core 7. The outer wall of the mold core 7 and the inner wall of the upper mold shell 5 are both conical surfaces. A mold cavity 8 is opened at the top of the mold core 7, and a sliding cavity 10 is opened on the inner wall of the lower mold shell 6. The inner wall of the sliding cavity 10 is slidably matched with a mold ejector pin 9. The outer wall of the top end of the mold ejector pin 9 slides with the mold core 7, and the top end of the mold core 7 and the outer wall of the top end of the cavity 8 are located in the same plane. The inner wall of the sliding cavity 10 is provided with a return spring 11. The outer wall of the mold ejector pin 9 is connected to the inner wall of the sliding cavity 10. The mold ejector pin 9 includes an upper ejector pin 12 and a lower ejector pin 13. The top end of the lower ejector pin 13 is provided with a connecting hole 14. The bottom end of the upper ejector pin 12 is connected to a connecting rod 15. The connecting rod 15 slides longitudinally with the connecting hole 14. The outer wall of the top end of the lower ejector pin 13 is threaded with a threaded sleeve 16. The outer wall of the bottom end of the upper ejector pin 12 is provided with an external thread threaded with the threaded sleeve 16.

[0027] After the mold has been used for a period of time, the forming mold 4 is removed from the base 1, the lower mold shell 6 is separated from the upper mold shell 5, the cavity 8 is removed, and the threaded sleeve 16 on the mold ejector 9 is rotated to disengage the threaded sleeve 16 from the upper ejector 12. At this time, the connection between the upper ejector 12 and the lower ejector 13 is disconnected, the connecting rod 15 is pulled out from the connecting hole 14, and then the new upper ejector 12 is connected to the lower ejector 13 by reverse operation to complete the replacement of the upper ejector 12. The connecting rod 15 is inserted into the connecting hole 14 to increase the connection area between the upper ejector 12 and the lower ejector 13, and the threaded sleeve 16 covers the connection between the upper ejector 12 and the lower ejector 13 to prevent the connection between the upper ejector 12 and the lower ejector 13 from being bent or broken when the mold ejector 9 rises to remove the material.

[0028] By arranging the upper mold shell 5, the lower mold shell 6, the upper ejector pin 12, the lower ejector pin 13 and the threaded sleeve 16, when the mold ejector pin 9 is worn and needs to be replaced, only the upper ejector pin 12 needs to be replaced, and there is no need to replace the entire mold ejector pin 9, thereby reducing the use cost.

[0029] By providing the connecting hole 14, the connecting rod 15 and the threaded sleeve 16, the connecting rod 15 is inserted into the connecting hole 14 to increase the connection area between the upper ejector 12 and the lower ejector 13, and the threaded sleeve 16 covers the connection between the upper ejector 12 and the lower ejector 13, thereby enhancing the stability of the connection between the upper ejector 12 and the lower ejector 13, and preventing the connection between the upper ejector 12 and the lower ejector 13 from being bent or broken by force when the mold ejector 9 rises to remove the material. Example

[0030] A cold heading die for automobile nuts. This embodiment makes the following improvements on the basis of embodiment 1: Figure 4 As shown, the forming mold 4 is connected to the base 1 through a connecting component, and the connecting component includes a connecting groove 17 and a sliding groove 18. The connecting groove 17 is opened on the outer wall of the base 1, and the sliding groove 18 is relatively opened on the side wall of the connecting groove 17. The forming mold 4 slides with the inner wall of the connecting groove 17. The inner wall of the bottom end of the connecting groove 17 is connected to a pushing plate 22 through a pushing spring 23. The pushing plate 22 slides with the inner wall of the connecting groove 17. The inner wall of the sliding groove 18 is slidingly connected to a positioning plate 19. The side wall of the forming mold 4 is provided with a limiting hole that is limited by the positioning plate 19. The top of the positioning plate 19 is threadedly engaged with a fixing bolt 20, and the bottom end of the sliding groove 18 is provided with a positioning hole 21 that is threadedly engaged with the fixing bolt 20.

[0031] When disassembling the forming mold 4, rotate the fixing bolt 20 to disengage the fixing bolt 20 from the positioning hole 21, and pull the positioning plate 19 to slide along the sliding groove 18 through the fixing bolt 20, so that one end of the positioning plate 19 is separated from the forming mold 4. At this time, the push spring 23 extends and pushes the forming mold 4 upward through the pushing plate 22, making it easier to remove the forming mold 4. When installing the forming mold 4, perform the above operations in reverse.

[0032] By setting up a connecting assembly, compared with traditional multi-bolt fixing, the disassembly time is shorter, which facilitates the disassembly of the forming mold 4. At the same time, the pushing spring 23 pushes the forming mold 4 through the pushing plate 22, which can avoid the forming mold 4 being difficult to remove from the base 1 due to the tight fit between the forming mold 4 and the base 1.

[0033] Working principle: After the mold has been used for a period of time, the forming mold 4 is removed from the base 1, the lower mold shell 6 is separated from the upper mold shell 5, the cavity 8 is removed, and the threaded sleeve 16 on the mold ejector pin 9 is rotated to disengage the threaded sleeve 16 from the upper ejector pin 12. At this time, the connection between the upper ejector pin 12 and the lower ejector pin 13 is disconnected, the connecting rod 15 is pulled out from the connecting hole 14, and then the new upper ejector pin 12 is connected to the lower ejector pin 13 in the reverse operation to complete the replacement of the upper ejector pin 12. The connecting rod 15 is inserted into the connecting hole 14 to increase the connection area between the upper ejector pin 12 and the lower ejector pin 13, and the threaded sleeve 16 covers the connection between the upper ejector 12 and the lower ejector 13 to prevent the connection between the upper ejector 12 and the lower ejector 13 from being bent or broken by force when the mold ejector 9 rises to remove the material; when disassembling the forming mold 4, rotate the fixing bolt 20 to disengage the fixing bolt 20 from the positioning hole 21, and pull the positioning plate 19 along the sliding groove 18 through the fixing bolt 20 to make one end of the positioning plate 19 disengage from the forming mold 4. At this time, the push spring 23 extends through the push plate 22 to push the forming mold 4 upward, making it easier to remove the forming mold 4. When installing the forming mold 4, perform the above operations in reverse.

[0034] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cold heading die for automobile nuts, comprising a base (1), characterized in that: The outer wall of one end of the base (1) is detachably mounted with a plurality of forming dies (4), the forming dies (4) comprising an upper die shell (5) and a lower die shell (6), the upper die shell (5) being threadedly connected to the lower die shell (6), the inner wall of the lower die shell (6) being provided with a sliding cavity (10), the inner wall of the sliding cavity (10) being slidably fitted with a die ejector pin (9), the die ejector pin (9) comprising an upper ejector pin (12) and a lower ejector pin (13), the top end of the lower ejector pin (13) being provided with a connecting hole (14), the bottom end of the upper ejector pin (12) being connected with a connecting rod (15), the connecting rod (15) being longitudinally slidably fitted with the connecting hole (14), the top outer wall of the lower ejector pin (13) being threadedly fitted with a threaded sleeve (16), the bottom outer wall of the upper ejector pin (12) being provided with an external thread threadedly fitted with the threaded sleeve (16).

2. The cold heading die for automobile nuts according to claim 1, characterized in that: Guide rods (3) are fixed to the outer walls of both sides of the base (1), and the outer walls of the two guide rods (3) are slidably connected to the same pressing plate (2). The outer wall of one end of the pressing plate (2) is provided with an extrusion block opposite to the forming die (4).

3. The cold heading die for automobile nuts according to claim 1, characterized in that: The inner wall of the upper mold shell (5) is slidably fitted with a mold core (7), and the outer wall of the mold core (7) and the inner wall of the upper mold shell (5) are both conical surfaces.

4. The cold heading die for automobile nuts according to claim 3, characterized in that: A cavity (8) is provided at the top of the mold core (7), the top of the mold core (7) and the outer wall of the top of the cavity (8) are located in the same plane, a return spring (11) is provided on the inner wall of the sliding cavity (10), and the outer wall of the mold ejector pin (9) is connected to the inner wall of the sliding cavity (10).

5. The cold heading die for automobile nuts according to claim 1, characterized in that: The forming die (4) and the base (1) are connected via a connecting assembly, wherein the connecting assembly comprises a connecting groove (17) and a sliding groove (18), wherein the connecting groove (17) is provided on the outer wall of the base (1), and the sliding groove (18) is provided on the side wall of the connecting groove (17).

6. The cold heading die for automobile nuts according to claim 5, characterized in that: The forming die (4) is in sliding engagement with the inner wall of the connecting groove (17); the inner wall at the bottom end of the connecting groove (17) is connected to a push plate (22) via a push spring (23); and the push plate (22) is in sliding engagement with the inner wall of the connecting groove (17).

7. The cold heading die for automobile nuts according to claim 5, characterized in that: The inner wall of the sliding groove (18) is slidably connected to a positioning plate (19), and the side wall of the forming mold (4) is provided with a limiting hole that cooperates with the positioning plate (19) for limiting.

8. The cold heading die for automobile nuts according to claim 7, characterized in that: The top end of the positioning plate (19) is threadedly engaged with a fixing bolt (20), and the bottom end of the sliding groove (18) is provided with a positioning hole (21) threadedly engaged with the fixing bolt (20).

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